I have a sample express.js app:
const express = require('express')
const app = express()
const port = 3000
app.get('/', (req, res) => {
res.send(`<!DOCTYPE html>
<html>
<body>
<h1>My First Heading</h1>
<p>My first paragraph.</p>
</body>
</html>`)
})
app.listen(port, () => {
console.log(`Example app listening on port ${port}`)
})
If I run this on localhost and open lighthouse tab in developer tools and measure performance I am getting FCP of 0.7 seconds for mobile (0.2 seconds for desktop).
Why is there such delay on localhost? Shouldn't it be almost instant?
